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The Range
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Reloads in a glock
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<blockquote data-quote="Dr. Tad Hussein Winslow" data-source="post: 1470016" data-attributes="member: 7123"><p>The reality is as follows, in my understanding and belief:</p><p></p><p>1. All pistols have a partially unsupported chamber at the 6 o'clock position at the case web, to varying degrees. However, Glocks have much more than some other pistols; they're towards the far end of the spectrum, of "more unsupported". Evidently, the pistol's design requires this to obtain the degree of reliability that the market demands (which admittedly is a high level of reliability in Glocks, as we all know - just like every other modern high- and mid-quality pistol).</p><p></p><p>2. .40 S&W is a high-pressure round, like 9mm - But, being crammed into existing 9mm platforms, with a larger diameter case, there is less "meat" / metal around the chamber, and sometimes in the frames, to support that pressure. So it's already a borderline round, pushed up against the edge of the safey margin, in most all of the platforms it's offered in. Not unsafe mind you - but pushing the envelope.</p><p></p><p>3. Factors #1 and #2 taken together, leave almost no wiggle room for reloading errors, for those pistols toward the "more unsupported end of the spectrum".</p><p></p><p>4. Of course, polygonal rifling exacerbates the pressure spike with lead buildup, so you're definitely doing the right thing getting an aftermarket for cast bullets. BUT, that still doesn't eliminate #1 - #3 - *depending upon* how unsupported the aftermarket 6-o'clock position is. Likely the aftermarket will NOT be *as* unsupported as factory Glock. But it will still be more unsupported than say, a Springfield XD factory barrel - this is simply due to the relatively poor design of the Glock (*cough* - notice a pattern?) which requires the "more unsupported" chamber to create the same reliability found in competitors with "less unsupported" 6 oclocks.</p><p></p><p>5. No matter how careful you are, reloading mistakes can and DO happen - we are human.</p><p></p><p>6. Most reloading errors that result in catastrophic failures are NOT simple overcharges, but actually double charges of a low-volumetric powder that you think the case is not charged but it is, and you pull the lever again on the whole block. Point is, you cannot eliminate this potential source of catastrophy simply by limiting your loads to well short of max. In fact, if anything, using smaller loads can make this chance of happening even *greater*, if you don't notice that the small charge is already in the case, you take a break and come back, and then charge them again - if they don't get so full that it prevents bullet seating, you may not notice that they're 'too full'. Only good lighting and careful attention to detail can do this (or I suppose always using high-volumetric powders).</p><p></p><p>All this taken together means that it's <em>probably prudent to not ever try your own reloads </em>at all in any Glock, period, unless one or both of these factors are present: (a) you are uber-meticulous in your reloading system/habits, or/and (b) Close examination of your after-market Glock barrel (bar-sto, etc) reveals an nearly-fully supported chamber - but then good luck trying to get it to run flawlessly.</p><p></p><p>But the same can be said for OTHER pistols with similarly "more unsupported" chambers in .40 S&W.</p><p></p><p>Just my two cents.</p><p></p><p><a href="http://www.thegunzone.com/glock/glock-kb-faq.html" target="_blank">http://www.thegunzone.com/glock/glock-kb-faq.html</a></p><p></p><p><a href="http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v238/Gixerman1000/40SWcasesupport.jpg&imgrefurl=http://www.thehighroad.org/showthread.php%3Ft%3D46122%26page%3D3&usg=__Afa6NXhB_bX7AzqIaMDiu8qO6Uc=&h=1132&w=500&sz=92&hl=en&start=0&zoom=1&tbnid=mcuCIbNGdZXcOM:&tbnh=165&tbnw=71&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images%3Fq%3Dphotgraph%2Bof%2B6%2Boclock%2Bunsupported%2Bchambers%2Bof%2Bvarious%2Bpistols%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-us%26biw%3D1659%26bih%3D842%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=90&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:0,s:0&tx=54&ty=45" target="_blank">http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v238/Gixerman1000/40SWcasesupport.jpg&imgrefurl=http://www.thehighroad.org/showthread.php?t=46122&page=3&usg=__Afa6NXhB_bX7AzqIaMDiu8qO6Uc=&h=1132&w=500&sz=92&hl=en&start=0&zoom=1&tbnid=mcuCIbNGdZXcOM:&tbnh=165&tbnw=71&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images?q=photgraph+of+6+oclock+unsupported+chambers+of+various+pistols&um=1&hl=en&sa=N&rls=com.microsoft:en-us&biw=1659&bih=842&tbs=isch:1&um=1&itbs=1&iact=rc&dur=90&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:0,s:0&tx=54&ty=45</a></p><p></p><p><a href="http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v423/Max-the-Silent/Gun%2520Collection/MVC-497S.jpg&imgrefurl=http://www.calguns.net/calgunforum/showthread.php%3Ft%3D140613&usg=__qXUHB-UuhFRMcwdHWV7pQ7oZIto=&h=480&w=640&sz=29&hl=en&start=0&zoom=1&tbnid=kllaq2FLemjS0M:&tbnh=165&tbnw=207&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images%3Fq%3Dphotgraph%2Bof%2B6%2Boclock%2Bunsupported%2Bchambers%2Bof%2Bvarious%2Bpistols%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-us%26biw%3D1659%26bih%3D842%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=1018&vpy=142&dur=5335&hovh=194&hovw=259&tx=134&ty=102&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:5,s:0" target="_blank">http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v423/Max-the-Silent/Gun%20Collection/MVC-497S.jpg&imgrefurl=http://www.calguns.net/calgunforum/showthread.php?t=140613&usg=__qXUHB-UuhFRMcwdHWV7pQ7oZIto=&h=480&w=640&sz=29&hl=en&start=0&zoom=1&tbnid=kllaq2FLemjS0M:&tbnh=165&tbnw=207&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images?q=photgraph+of+6+oclock+unsupported+chambers+of+various+pistols&um=1&hl=en&sa=N&rls=com.microsoft:en-us&biw=1659&bih=842&tbs=isch:1&um=1&itbs=1&iact=hc&vpx=1018&vpy=142&dur=5335&hovh=194&hovw=259&tx=134&ty=102&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:5,s:0</a></p><p></p><p>Sidebar - at H&H, they have for sale one of the Glocks that are cut up to show the inner workings of the pistol. We had a good laugh yesterday that this was one of the many Kb'ed Glocks for sale - well, it was funnier in person.</p></blockquote><p></p>
[QUOTE="Dr. Tad Hussein Winslow, post: 1470016, member: 7123"] The reality is as follows, in my understanding and belief: 1. All pistols have a partially unsupported chamber at the 6 o'clock position at the case web, to varying degrees. However, Glocks have much more than some other pistols; they're towards the far end of the spectrum, of "more unsupported". Evidently, the pistol's design requires this to obtain the degree of reliability that the market demands (which admittedly is a high level of reliability in Glocks, as we all know - just like every other modern high- and mid-quality pistol). 2. .40 S&W is a high-pressure round, like 9mm - But, being crammed into existing 9mm platforms, with a larger diameter case, there is less "meat" / metal around the chamber, and sometimes in the frames, to support that pressure. So it's already a borderline round, pushed up against the edge of the safey margin, in most all of the platforms it's offered in. Not unsafe mind you - but pushing the envelope. 3. Factors #1 and #2 taken together, leave almost no wiggle room for reloading errors, for those pistols toward the "more unsupported end of the spectrum". 4. Of course, polygonal rifling exacerbates the pressure spike with lead buildup, so you're definitely doing the right thing getting an aftermarket for cast bullets. BUT, that still doesn't eliminate #1 - #3 - *depending upon* how unsupported the aftermarket 6-o'clock position is. Likely the aftermarket will NOT be *as* unsupported as factory Glock. But it will still be more unsupported than say, a Springfield XD factory barrel - this is simply due to the relatively poor design of the Glock (*cough* - notice a pattern?) which requires the "more unsupported" chamber to create the same reliability found in competitors with "less unsupported" 6 oclocks. 5. No matter how careful you are, reloading mistakes can and DO happen - we are human. 6. Most reloading errors that result in catastrophic failures are NOT simple overcharges, but actually double charges of a low-volumetric powder that you think the case is not charged but it is, and you pull the lever again on the whole block. Point is, you cannot eliminate this potential source of catastrophy simply by limiting your loads to well short of max. In fact, if anything, using smaller loads can make this chance of happening even *greater*, if you don't notice that the small charge is already in the case, you take a break and come back, and then charge them again - if they don't get so full that it prevents bullet seating, you may not notice that they're 'too full'. Only good lighting and careful attention to detail can do this (or I suppose always using high-volumetric powders). All this taken together means that it's [I]probably prudent to not ever try your own reloads [/I]at all in any Glock, period, unless one or both of these factors are present: (a) you are uber-meticulous in your reloading system/habits, or/and (b) Close examination of your after-market Glock barrel (bar-sto, etc) reveals an nearly-fully supported chamber - but then good luck trying to get it to run flawlessly. But the same can be said for OTHER pistols with similarly "more unsupported" chambers in .40 S&W. Just my two cents. [url]http://www.thegunzone.com/glock/glock-kb-faq.html[/url] [url]http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v238/Gixerman1000/40SWcasesupport.jpg&imgrefurl=http://www.thehighroad.org/showthread.php%3Ft%3D46122%26page%3D3&usg=__Afa6NXhB_bX7AzqIaMDiu8qO6Uc=&h=1132&w=500&sz=92&hl=en&start=0&zoom=1&tbnid=mcuCIbNGdZXcOM:&tbnh=165&tbnw=71&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images%3Fq%3Dphotgraph%2Bof%2B6%2Boclock%2Bunsupported%2Bchambers%2Bof%2Bvarious%2Bpistols%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-us%26biw%3D1659%26bih%3D842%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=90&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:0,s:0&tx=54&ty=45[/url] [url]http://www.google.com/imgres?imgurl=http://img.photobucket.com/albums/v423/Max-the-Silent/Gun%2520Collection/MVC-497S.jpg&imgrefurl=http://www.calguns.net/calgunforum/showthread.php%3Ft%3D140613&usg=__qXUHB-UuhFRMcwdHWV7pQ7oZIto=&h=480&w=640&sz=29&hl=en&start=0&zoom=1&tbnid=kllaq2FLemjS0M:&tbnh=165&tbnw=207&ei=szlpTY3qGI6asAO0pfGEDw&prev=/images%3Fq%3Dphotgraph%2Bof%2B6%2Boclock%2Bunsupported%2Bchambers%2Bof%2Bvarious%2Bpistols%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-us%26biw%3D1659%26bih%3D842%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=1018&vpy=142&dur=5335&hovh=194&hovw=259&tx=134&ty=102&oei=szlpTY3qGI6asAO0pfGEDw&page=1&ndsp=30&ved=1t:429,r:5,s:0[/url] Sidebar - at H&H, they have for sale one of the Glocks that are cut up to show the inner workings of the pistol. We had a good laugh yesterday that this was one of the many Kb'ed Glocks for sale - well, it was funnier in person. [/QUOTE]
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